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Texas Instruments 74ACT16240DLR
- Part No.:
- 74ACT16240DLR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16240DLR.pdf
- Description:
- IC BUFF INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,442
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Product details
Overview
74ACT16240DLR from Texas Instruments is a 16-bit inverting buffer/driver with 3-state outputs, designed for memory address driving, bus interfacing, and clock distribution in high-density digital systems. It operates from 4.5 V to 5.5 V, delivers ±24 mA output drive, supports –40°C to 85°C industrial temperature range, and features flow-through pinout in a 48-pin SSOP (DL) package.
For engineers reviewing the 74ACT16240DLR datasheet, 74ACT16240DLR pinout, 74ACT16240DLR application, or 74ACT16240DLR equivalent, key selection criteria include TTL-compatible inputs, symmetrical active-low OE control per 4-bit section, 3.94 V VOH at 24 mA (VCC = 4.5 V), sub-10 ns propagation delay, and distributed VCC/GND layout for noise suppression.
Technical Context
The 74ACT16240DLR implements four independent 4-bit inverting buffer sections, each with dedicated active-low output-enable (OE) input. Each section drives up to ±24 mA into loads while maintaining TTL-level input compatibility and CMOS-level output swing.
Its EPIC™ 1-µm CMOS process enables 500-mA latch-up immunity at 125°C and low dynamic power dissipation - 38 pF typical power-dissipation capacitance per enabled driver at 1 MHz/50 pF load. The flow-through architecture places inputs on one side and outputs on the opposite side to minimize PCB trace crossovers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic rails and tolerant of supply ripple. |
| Output Drive | ±24 mA - sufficient to directly drive 50-Ω transmission lines or multiple TTL inputs without external buffering. |
| Propagation Delay | 2.3–8.5 ns (tPLH/tPHL) - enables reliable operation in high-speed address/data buses up to ~100 MHz. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - interfaces seamlessly with legacy 74LS/TTL logic families. |
| 3-State Leakage | ±5 µA max (IOZ) - ensures minimal bus contention during output disable, critical for shared-bus integrity. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure. |
| Package | 48-pin SSOP (DL), 300-mil width, 0.025-in pitch - provides double the I/O density of standard SOIC in same PCB area. |
Pinout & Package
74ACT16240DLR is housed in a 48-pin Shrink Small-Outline Package (SSOP, DL), measuring 15.4 mm × 7.5 mm × 2.4 mm, with 0.65 mm lead pitch and RoHS-compliant NiPdAu finish (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24, 25, 48 | Active-Low Output Enable (1OE–4OE) | Independent control per 4-bit section; all must be low for corresponding Y outputs to be active. |
| 47–43, 41–37, 36–32, 30–26 | Inputs (1A1–1A4, 2A1–2A4, etc.) | TTL-compatible inputs; inverted logic passed to corresponding Y outputs. |
| 2–6, 8–12, 13–17, 19–23 | Outputs (1Y1–1Y4, 2Y1–2Y4, etc.) | 3-state CMOS outputs; high-impedance when respective OE is high. |
| 7, 18, 28, 42 | VCC | Distributed power pins reduce simultaneous switching noise; connect to local 5-V decoupling capacitors. |
| 4, 10, 15, 21, 34, 39, 45 | GND | Seven ground pins provide low-inductance return paths for all 16 drivers and enable clean signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-State Buffers | Four independent 4-bit sections allow flexible partitioning (e.g., 16-bit, dual 8-bit, or quad 4-bit bus isolation). |
| Flow-Through Pinout | Inputs on left/right edges and outputs on opposite side simplify layer routing and eliminate vias in dense PCB layouts. |
| Distributed VCC/GND | Four VCC and seven GND pins minimize ground bounce and supply droop during simultaneous switching of all 16 outputs. |
| EPIC™ Process Robustness | 500-mA latch-up immunity at 125°C ensures reliability in thermally stressed industrial applications. |
| TTL-Compatible Inputs | Accepts standard 74LS/74F logic thresholds without level-shifting, enabling drop-in upgrades in legacy designs. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/Flash in embedded control systems. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address lines from memory array; enables multi-drop bus sharing with DMA controllers. Use Value: Sub-10 ns tPHL/tPLH ensures setup/hold timing margins are maintained at 25-MHz bus clocks; distributed GND pins suppress address skew under heavy switching. |
Use Scenario: Bidirectional data bus isolation between FPGA and peripheral ASIC in test equipment backplane. IC Role / Device Role / Timing Role: One-directional 16-bit driver stage controlled by system direction signal; used in conjunction with complementary transceivers. Use Value: ±24 mA drive strength sustains signal integrity across 10-cm FR4 traces; 3-state leakage <5 µA prevents data corruption during bus arbitration. |
| Clock Distribution Network | Industrial I/O Expansion |
|
Use Scenario: Fan-out and level translation of a 5-V system clock to multiple synchronous logic blocks. IC Role / Device Role / Timing Role: Low-skew inverting buffer replicating clock signal to four downstream domains with independent OE gating. Use Value: Matched tPLH/tPHL (2.3–4.1 ns typical) minimizes inter-channel skew; flow-through layout avoids clock trace stubs that cause reflections. |
Use Scenario: Interfacing PLC CPU module to 16-channel isolated digital input card via ribbon cable. IC Role / Device Role / Timing Role: Signal conditioner and bus driver between 3.3-V controller and 5-V field-side logic; provides noise margin and current gain. Use Value: TTL-compatible inputs tolerate 0.8–2.0 V noise on long cables; 500-mA latch-up immunity survives ESD events common in factory floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16244DLR | Non-inverting output logic; otherwise identical pinout, drive, and timing. | Used where signal polarity must be preserved (e.g., data path buffering without inversion). | Select 74ACT16244DLR when system logic requires true (non-inverted) buffering; verify OE timing and voltage thresholds match. |
| SN74LVC16244ADGGR | 3.3-V only (1.65–3.6 V), higher speed (tPD ≈ 3.2 ns), lower drive (±24 mA @ 3.3 V), different pinout. | Suitable for modern low-voltage mixed-signal systems; not pin-compatible or voltage-compatible with 74ACT16240DLR. | Choose SN74LVC16244ADGGR only in new 3.3-V designs; requires PCB redesign and level-shifting if replacing 74ACT16240DLR. |
Compared with 74ACT16240DLR, the 74ACT16244DLR offers functional equivalence with polarity inversion removed - ideal for direct replacement where logic inversion is undesirable. The SN74LVC16244ADGGR enables lower-power, higher-speed operation but mandates full electrical and mechanical redesign due to voltage domain and package incompatibility.
Availability
74ACT16240DLR is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and programmable logic interface applications requiring stable component supply across extended product lifecycles.
Supply support for 74ACT16240DLR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The 74ACT16240DLR belongs to TI's Widebus™ family of high-speed CMOS logic devices, engineered specifically to increase board density and signal integrity in memory addressing, bus driving, and clock distribution systems.
FAQ
What is the operating voltage range for the 74ACT16240DLR?
The 74ACT16240DLR operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V TTL and CMOS logic families while providing margin against rail droop in noisy industrial environments. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings.
Does the 74ACT16240DLR support hot insertion or live bus swapping?
The 74ACT16240DLR is not explicitly rated for hot insertion. Its absolute maximum input voltage is –0.5 V to VCC + 0.5 V, and IOZ leakage is specified only under static conditions. For live bus applications, external protection circuitry (e.g., series resistors, TVS diodes) and careful sequencing of VCC, OE, and signal lines are required to avoid overstress.
How many independent 3-state control inputs does the 74ACT16240DLR have?
The 74ACT16240DLR has four independent active-low output-enable inputs: 1OE (pin 1), 2OE (pin 24), 3OE (pin 25), and 4OE (pin 48). Each controls a separate 4-bit buffer section, enabling granular bus segmentation - for example, enabling only address bits A0–A3 while holding A4–A15 in high-impedance.
What is the maximum output current per pin for the 74ACT16240DLR?
The 74ACT16240DLR supports a continuous output current of ±24 mA per pin under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to 85°C). This rating applies to both sourcing (IOH) and sinking (IOL) modes and is validated per JEDEC JESD78 guidelines for latch-up immunity and thermal stability.
Is the 74ACT16240DLR pin-compatible with the 74ACT16244DLR?
Yes - the 74ACT16240DLR and 74ACT16244DLR share identical 48-pin DL package dimensions, pinout mapping, and DC/AC electrical specifications, differing only in logic function: the 74ACT16240DLR provides inverting outputs, while the 74ACT16244DLR provides non-inverting outputs. No PCB change is needed for functional substitution where polarity inversion is acceptable or compensated in firmware.
74ACT16240DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74ACT16240DLR FAQ
1.How can I place an order for 74ACT16240DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16240DLR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74ACT16240DLR reliable?
The price and inventory of 74ACT16240DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16240DLR is usually 5 days.
3.What payment methods are accepted for 74ACT16240DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16240DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16240DLR?
74ACT16240DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16240DLR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74ACT16240DLR?
For technical support, including 74ACT16240DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16240DLR requirements.
6.How does Aetrix verify that 74ACT16240DLR is sourced from the original manufacturer or authorized distributors?
All 74ACT16240DLR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74ACT16240DLR meets industry standards.
7.What is the process for return or replacement of 74ACT16240DLR?
All 74ACT16240DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16240DLR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74ACT16240DLR part is unused and in its original packaging.
Return procedure for 74ACT16240DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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